Update to libgda-5.1.2 for modern Anjuta.

This moves to Gnome 3 environment.
Update GDL to 3.10.0 for the Gnome 3 version.
Update to Anjuta 3.10.0 which builds with modern graphviz.
Anjuta 3.10.0
Retire gnome-build.
- gnome-build.
Retire libgnomedb.